:root {
    --grid-gap: 1.5rem;
    --header-height: 80px;
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
    --text-color: #2c3e50;
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --border-color: #e0e0e0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--bg-color);
    color: var(--text-color);
}

header {
    height: var(--header-height);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.875rem;
    opacity: 0.9;
}

.controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.btn {
    padding: 0.5rem 1.25rem;
    border: 2px solid white;
    background: transparent;
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s;
}

.btn:hover {
    background: white;
    color: var(--primary-color);
}

.btn-primary {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    color: white;
}

.status {
    padding: 0.4rem 0.875rem;
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status.connected {
    background: var(--success-color);
    color: white;
}

.status.disconnected {
    background: var(--error-color);
    color: white;
}

.status.connecting {
    background: var(--warning-color);
    color: white;
}

.timestamp {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.timestamp-time {
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.2;
}

.timestamp-date {
    font-size: 0.8rem;
    opacity: 0.9;
}

.grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--grid-gap);
    padding: var(--grid-gap);
    overflow: auto;
}

.grid-item {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    min-height: 600px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
    transition: transform 0.2s, box-shadow 0.2s;
}

.grid-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.12);
}

.grid-item-header {
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.grid-item-title {
    font-weight: 700;
    font-size: 0.9375rem;
    color: var(--text-color);
}

.expand-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    margin: -0.25rem -0.5rem;
    border-radius: 4px;
    font-size: 1.125rem;
    color: var(--text-color);
    opacity: 0.5;
    transition: opacity 0.2s, background 0.2s;
}

.expand-btn:hover {
    opacity: 1;
    background: rgba(0, 0, 0, 0.08);
}

.expand-btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.grid-item iframe {
    flex: 1;
    border: none;
    width: 100%;
    background: white;
}

dialog {
    margin: auto;
    max-width: 800px;
    max-height: 85vh;
    border: none;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 0;
}

dialog::backdrop {
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.dialog-content {
    padding: 2.5rem;
    overflow-y: auto;
    max-height: 85vh;
}

.dialog-content h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.75rem;
}

.dialog-content h3 {
    color: var(--text-color);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    font-size: 1.125rem;
}

.dialog-content p {
    line-height: 1.7;
    margin-bottom: 1rem;
    color: #555;
}

.code-block {
    background: #f5f5f5;
    padding: 1.25rem;
    border-radius: 6px;
    overflow-x: auto;
    font-size: 0.8125rem;
    font-family: 'Courier New', Courier, monospace;
    line-height: 1.6;
    border: 1px solid var(--border-color);
    max-height: 300px;
    overflow-y: auto;
}

.models-list {
    list-style: none;
    padding: 0;
}

.models-list li {
    padding: 0.5rem 1rem;
    margin-bottom: 0.5rem;
    background: #f8f9fa;
    border-radius: 6px;
    border-left: 3px solid var(--primary-color);
}

.attribution {
    color: #666;
    font-size: 0.875rem;
    margin: 0.5rem 0;
}

.attribution a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.attribution a:hover {
    text-decoration: underline;
}

details {
    margin: 1rem 0;
}

summary {
    cursor: pointer;
    padding: 0.75rem;
    background: #f8f9fa;
    border-radius: 6px;
    font-weight: 600;
    user-select: none;
}

summary:hover {
    background: #e9ecef;
}

#close-dialog {
    margin-top: 2rem;
    width: 100%;
}

/* Expand dialog */
#expand-dialog {
    width: 95vw;
    height: 95vh;
    max-width: 95vw;
    max-height: 95vh;
    padding: 0;
    border: none;
    border-radius: 12px;
    overflow: hidden;
}

#expand-dialog::backdrop {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(6px);
}

.expand-dialog-content {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--card-bg);
}

.expand-dialog-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border-bottom: 1px solid var(--border-color);
}

.expand-dialog-title {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text-color);
}

.expand-close-btn {
    background: transparent;
    border: none;
    font-size: 1.75rem;
    cursor: pointer;
    color: var(--text-color);
    opacity: 0.7;
    padding: 0.25rem 0.5rem;
    margin: -0.25rem -0.5rem;
    border-radius: 4px;
    line-height: 1;
    transition: opacity 0.2s, background 0.2s;
}

.expand-close-btn:hover {
    opacity: 1;
    background: rgba(0, 0, 0, 0.08);
}

.expand-close-btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.expand-iframe {
    flex: 1;
    border: none;
    width: 100%;
    background: white;
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        height: auto;
        padding: 1rem;
        gap: 1rem;
    }

    .controls {
        flex-wrap: wrap;
        justify-content: center;
    }

    .grid {
        grid-template-columns: 1fr;
    }

    .dialog-content {
        padding: 1.5rem;
    }

    #expand-dialog {
        width: 100vw;
        height: 100vh;
        max-width: 100vw;
        max-height: 100vh;
        border-radius: 0;
    }

    .expand-dialog-header {
        padding: 0.75rem 1rem;
    }
}